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        <ul class="test">
            <li><a href="test02.html"><img src="img/11.png"><br/>第二次作业</a></li>
            <li><a href="test03.html"><img src="img/11.png"><br/>第三次作业</a></li>
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        <ul class="experiment">
            <li><a href="experiment01.html"><img src="img/11.png"><br/>第一次实验</a></li>
            <li><a href="experiment02.html"><img src="img/11.png"><br/>第二次实验</a></li>
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